code: def setUp(self, world_size=DEFAULT_WORLD_SIZE):
      super(MultiProcessTestCase, self).setUp()
  
      crypten.debug.configure_logging()
  
      self.world_size = world_size
      self.default_tolerance = 0.5
      self.queue = self.mp_context.Queue()
  
      # This gets called in the children process as well to give subclasses a
      # chance to initialize themselves in the new process
      if self.rank == self.MAIN_PROCESS_RANK:
          self.file = tempfile.NamedTemporaryFile(delete=True).name
          self.processes = [
              self._spawn_process(rank) for rank in range(world_size)
          ]
          if crypten.mpc.ttp_required():
              self.processes += [self._spawn_ttp()]
  
imports: import multiprocessing
  import os
  import sys
  import tempfile
  import traceback
  import unittest
  import warnings
  from functools import wraps
  import crypten.communicator
  import crypten.debug
  import torch
  import torch.distributed
  from crypten.config import cfg
label_desc: Use image node_id 4 for calling the MultiProcessTestCase obj's underlying member method code with example usage: obj.setUp(world_size) without return types